Basically I considerjust about anything I find other than beer cans and tabs to be treasure.Finding old tools is cool as hell.You don't need to spend a ton but if you do they have accessories that are bad to the bone.Like I said earlier 90% of the time I know pretty much what an item is before I bother to start digging.I think the real inexpensive ones go only on tone wheras mine uses tone,a visual pic and a number.Its really all in the coil if you don't mind digging things you're unsure of,you can get a cheap detector and use a quality deep scan coil